Instruction manual

CLASS: Calling Number and Name Delivery Page 1103 of 3156
Features and Services
Network engineering for CLASS sets
In a Meridian 1 system with a single group network, the network internal
blocking is determined by the concentration ratio of equipped ports on
peripheral equipment and the number of interfaced loops or superloops.
Depending on traffic engineering, a non-blocking network is achievable.
In a multi-group system, intergroup junctors are required to switch calls
between two network groups. Due to the concentration of time slots from a
network group to that of inter-group junctors, blocking may occur. This is
true for a multi-group Meridian 1 with or without CLASS sets. However,
since the CLASS feature depends on a voice path to deliver Calling Name and
Number Delivery (CND) to a set, excessive congestion at the inter-group
junctor could block the delivery of CND and diminish the usefulness of the
feature, as well as impact the grade of service of the existing equipment on
the system.
This engineering section examines the inter-group junctor blocking issue and
provides recommend engineering rules to alleviate potential network
congestion problems.
In general, the engineering effort for CLASS feature can be classified into
three categories:
A new site following engineering rules (see page 1111) requires no inter-
group junctor traffic check-off.
An existing or new site with relatively low inter-group junctor traffic, will
require only one XCMC (Extended CLASS Modem Card) IPE pack that can
serve all CLASS sets in a multi-group system.
An existing site with heavy inter-group junctor traffic will require either
moving trunks/sets around between network groups when only one XCMC
pack is equipped or providing an XCMC pack (or packs) for each group.